Read the following reactions. Reaction 1: NaCl(s) -> Na+ (aq) + CI-
Reaction 2: N2 + 3H2 -> 2NH3

Which reaction leads to an increase in entropy?

Only Reaction 1
Only Reaction 2
Both Reaction 1 and 2
Neither Reaction 1 nor 2
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Only Reaction 1

Explanation:

In reaction 1, there is a change in state from solid to liquid. Hence, there is an increase in number of ways particles and their energies could be arranged. As a result, entropy increases.

In reaction 2, there is a decrease in amount of gas particles (4 mol to 2 mol). Hence there is a decrease in the number of ways particles and their energies could be arranged. As a result entropy decreases

it is the most commonly accepted one